/**
 * ***************************************************************************** Copyright (c) 2005,
 * 2006 Subclipse project and others. All rights reserved. This program and the accompanying
 * materials are made available under the terms of the Eclipse Public License v1.0 which accompanies
 * this distribution, and is available at http://www.eclipse.org/legal/epl-v10.html
 *
 * <p>Contributors: Subclipse project committers - initial API and implementation
 * ****************************************************************************
 */
package org.tigris.subversion.subclipse.ui.authentication;

import java.util.Vector;
import org.xml.sax.Attributes;
import org.xml.sax.helpers.DefaultHandler;

class KeyFileHistoryContentHandler extends DefaultHandler {

  private StringBuffer buffer;
  private Vector keyFiles;

  public KeyFileHistoryContentHandler() {}

  public void characters(char[] chars, int startIndex, int length) {
    if (buffer == null) return;
    buffer.append(chars, startIndex, length);
  }

  public void startElement(String namespaceURI, String localName, String qName, Attributes atts) {
    String elementName = getElementName(namespaceURI, localName, qName);

    if (elementName.equals(KeyFilesManager.ELEMENT_KEYFILE)) {
      buffer = new StringBuffer();
      return;
    }
    if (elementName.equals(KeyFilesManager.ELEMENT_KEYFILE_HISTORY)) {
      keyFiles = new Vector(KeyFilesManager.MAX_FILES);
      return;
    }
  }

  public void endElement(String namespaceURI, String localName, String qName) {
    String elementName = getElementName(namespaceURI, localName, qName);

    if (elementName.equals(KeyFilesManager.ELEMENT_KEYFILE)) {
      keyFiles.add(buffer.toString());
      buffer = null;
      return;
    }
    if (elementName.equals(KeyFilesManager.ELEMENT_KEYFILE_HISTORY)) {
      KeyFilesManager.previousKeyFiles = new String[keyFiles.size()];
      keyFiles.copyInto(KeyFilesManager.previousKeyFiles);
      return;
    }
  }

  private String getElementName(String namespaceURI, String localName, String qName) {
    if (localName != null && localName.length() > 0) {
      return localName;
    } else {
      return qName;
    }
  }
}
